[jira] [Closed] (ARROW-3478) [C++] API add value / null mask buffer accessor to ArrayData

["Wolf Vollprecht (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-3478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wolf Vollprecht closed ARROW-3478.
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    Resolution: Fixed

> [C++] API add value / null mask buffer accessor to ArrayData
> ------------------------------------------------------------
>
>                 Key: ARROW-3478
>                 URL: https://issues.apache.org/jira/browse/ARROW-3478
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wolf Vollprecht
>            Priority: Minor
>
> Currently, the ArrayData struct has the `std::vector<Buffer> buffers` member.
> The buffers will (from reading the code) either be [null_mask, data] or [data] (if the null mask does not exist).
> I'm not sure if there is an easy way to get the null mask reliably at the moment. If I am understanding correctly, the way to do it right now is to check if the vector has one or two elements, and then use `buffers[0]` as the null mask, and `buffers[1]` as the values.
> I also did not find information regarding this in the spec. So I am not sure if I can rely on this behavior in future versions of the library.
> I am wondering wether adding explicit API for this would make this more reliable. 
>  
> For example two more interface functions
>  * `std::shared_ptr<Buffer> mask()`
>  * `std::shared_ptr<Buffer> values()` 
> Would make it easy for me to rely on the interface to "do the right thing".
>  
> Or am I missing something?



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